it is if they've already bought for the kids, drinks (3.50) each, popcorn, candy, all people want to do is get what they want to snack on and sit down. to punish the high school kids that work concession because they didn't upsell what the people hadn't ordered (they had a manager who was behind concessions precisely for this reason, to listen), I think is a bitttttttttt excessive.
I understand but this practice is very common. In a rush before a movie nobody has time for this I agree you want to get out of there asap because you think you're missing the start.